Fan operating status monitoring system

Abstract

A fan operating status monitoring system includes a detecting module to detect pulsation currents generated by the rotation of a fan, and further convert the detected pulsation currents to voltage signals, thereby allowing a differential magnifying module, a first processing module, and a control module to process the pulse wave signals in orders to measure the rotation speeds of the fan. Also, the second processing module and the control module can process the pulsation electric current signals so as to calculate the working currents of the fan, thereby expanding the measuring range of the rotation speeds of the fan, and at the same time, effectively controlling the operating status of the fan.

1. A fan operating status monitoring system, comprising:
 a detecting module, which is used for detecting pulsation currents generated from a rotation of a fan, and further converting the detected pulsation currents to pulsation voltage signals; 
 a differential magnifying module, which is used for receiving said pulsation voltage signals, and further processing the received pulsation voltage signals by differential magnification and wave filtering so as to generate analog magnification signals; 
 a first processing module, which is used for receiving said analog magnified signals, and further converting said analog magnified signals into pulse wave signals in order to measure a frequency of said pulse wave signals; 
 a second processing module, which is used for receiving the pulsation currents detected by the detecting module, and further processing said pulsation currents so as to generate digital signals and then transmitting the digital signals; and 
 a control module, which is used for receiving the digital signals transmitted from the second processing module and measuring a speed of the rotation of the fan based on the frequency of the pulse wave signals calculated by the first processing module, and further measuring the working currents of the fan based on the digital signals generated by the second processing module. 
 
   
   
     2. The fan operating status monitoring system of  claim 1 , wherein the detecting module is an electric resistance in series connection with the fan. 
   
   
     3. The fan operating status monitoring system of  claim 2 , wherein the differential magnifying module is a differential signal sensor circuit that can intercept voltage signals on both ends of said electric resistance, and also proceed to magnify the intercepted voltage signals by means of differentiation and wave filtering so as to generate output of magnified signals. 
   
   
     4. The fan operating status monitoring system of  claim 1 , wherein the first processing module is comprised of:
 an analog to digital converting module used for converting the magnified signals into pulse wave signals; and 
 a frequency-counting module used for receiving said pulse wave signals to count the frequency of said pulse wave signals, and further transmitting the counted result to said control module for calculating the rotation speeds of the fan accordingly. 
 
   
   
     5. The fan operating status monitoring system of  claim 4 , wherein the analog to digital converting module is an analog to digital converter. 
   
   
     6. The fan operating status monitoring system of  claim 4 , wherein the frequency-counting module  142  is a single chip circuit adapted for counting the frequency. 
   
   
     7. The fan operating status monitoring system of  claim 1 , wherein the second processing module is comprised of:
 a first converting module used for receiving the pulsation currents detected by the detecting module, and further converting the pulsation currents into direct electric current signals; and 
 a second converting module for converting direct electric current signals into digital signals, and further transmitting digital signals to a control module for calculating the working electric currents of the fan accordingly. 
 
   
   
     8. The fan operating status monitoring system of  claim 7 , wherein the first converting module is an average current circuit. 
   
   
     9. The fan operating status monitoring system of  claim 7 , wherein the second converting module is a voltage measuring device that can convert the direct current flowing through therein into digital voltage signals, allowing the control module to measure the working currents of the fan according to said digital voltage signals and the equivalent electric resistance measured by said voltage measuring device.